Oki C610dtn User Manual page 100

8. Turn the two fasteners (a) 90° to the right until they lock. This will
secure the belt unit in place.
9. Replace the four image drums, complete with their toner
cartridges, into the printer in the same sequence as they
came out: cyan (nearest the rear), magenta, yellow and
black (nearest the front).
10. Finally, close the top cover and press down firmly at both
sides so that the cover latches closed.
a
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– C610/C711 User's Guide
a